What is Frequency Sensing Technology (FST)?

Frequency Sensing Technology (FST) is a patented system that allows the shocks to automatically adjust their damping based on the frequency of road impacts. This means the shocks can react differently to small bumps versus large ones, providing a more comfortable and controlled ride.

How do I adjust the spring preload on these shocks?

The 444 Series shocks feature a top-mounted threaded preload adjuster. You can simply twist this cap by hand to fine-tune the spring preload without the need for any special tools.

What are the different spring rate options and why do they matter?

These shocks are available in standard, heavy-duty (for riders over 250 lbs), and super heavy-duty (for touring models over 350 lbs) spring rates. Choosing the correct spring rate ensures the shocks perform optimally for your specific riding weight and load, providing the best balance of comfort and support.

Progressive Harley 444 Series Shocks 11.5in - Black

Specifications

Brand: Progressive
Part #: 444-4060B
UPC: 444-4060B

Progressive Harley 444 Series Shocks 11.5in - Black

Name: Progressive Harley 444 Series Shocks 11.5in - Black
Brand: Progressive
Price: 860.95 USD
Availability: InStock

$860.95

On Backorder

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Progressive Harley 444 Series Shocks 11.5in - Black. Features Frequency Sensing Technology for an improved, comfortable ride.

Key Features

Fits a wide range of Harley-Davidson motorcycles, including Road King, Street Glide, and Road Glide models.
Features patented Frequency Sensing Technology (FST) that automatically adjusts damping for improved ride comfort.
Progressive rate spring provides a balance of comfort and support.
Deflective disc valving ensures consistent damping performance.
Top mount threaded preload adjuster allows for easy, tool-free fine-tuning.
Available in standard, heavy-duty, and super heavy-duty spring rates to match rider weight.

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Will this fit your vehicle?

Product Details

These Progressive 444 Series shocks, measuring 11.5 inches and finished in black, are designed to fit a wide range of Harley-Davidson touring motorcycles, including popular models like the Road King, Street Glide, and Road Glide. They replace your stock shocks to offer a significantly more comfortable and controlled ride, especially over varied road surfaces. The core of their performance comes from Progressive's patented Frequency Sensing Technology (FST), which allows the shocks to automatically adjust their damping based on the frequency of bumps encountered. This means whether you're dealing with small road imperfections or larger impacts, the shocks distribute oil through their ports to absorb the hit effectively, leading to a smoother experience for the rider.

Beyond the FST, these shocks incorporate a deflective disc valving system and a progressive rate spring. The progressive spring rate means the spring gets stiffer as it compresses, providing a balance of comfort on smaller bumps and support for larger ones or when carrying extra weight. Adjusting the spring preload is straightforward thanks to the top-mounted threaded adjuster, which you can turn by hand without needing special tools. This allows you to fine-tune the suspension for your specific riding style, load, or road conditions. The shocks are well-built with a black finish and come with a limited lifetime warranty, reflecting their durability and the manufacturer's confidence in their construction.

When installing these shocks, you'll want to consider the different spring rate options available to match your typical riding weight. Progressive offers standard, heavy-duty (for riders over 250 lbs), and super heavy-duty (for touring models over 350 lbs) spring configurations. Ensure you select the correct one for your needs to get the most out of the FST and progressive spring technology. This upgrade is a popular choice for riders looking to significantly improve their motorcycle's handling and comfort on longer rides.